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(No Model I Y 5 J. M. GRIEST.

ART 0F RlVETING METALS TOGETHER. L

No. 290,229'. Patented, Deo. 18, 18.83.

UNITED STATES PATENT OFFICE. 'y

AJOHN M. GEIEsT, OE CHICAGO, ILLINOIS, AssIGNOE, EY MEsNE AssIcN- MENTs, To THE CHICAGO ATTACHMENT COMPANY, OE sAME PLACE.

ART OF RIVETING METALS TOGETHER.

SPECIFICATION forming part of Letters Patent No. 290,229, dated December 1S, 1883.

Application filed January 22, 1883.

To all whom it may concern,.-

Be it known that I, JOHN M. GRIEsT, of Chicago, in the county of Cook and State of Illinois, a citizen of the United States of America, have invented certain new and useful Improvements in the Art of Riveting Metals Together, of which the following, in connection with the accompanying drawings, is a specification.

In the drawings, Figure 1 is an edge view of a'metallic piece upon which the irst step 1n my process has been performed. Fig. 2 is a vertical central longitudinalsection of the same. Fig. 3 is a like representation of two parts riveted together by means of my improved process, showing' in part the means employed for heading or spreading and completing the rivets. Fig. 4 is avertical central longitudinal section of the two pieces riveted together, and Fig. 5 is a top View of one of the riveted pieces.

Like letters of reference indicate like parts.

A represents a piece of comparatively soft metal, such as brass, and a a are studs punched partly out therefrom by means of dies and punches, but not wholly removed therefrom, as shown. This is the iirst step relating to the formation of the rivets, and may be performed by means of any well-known or suitable dies adapted for that purpose.

B in the example shown represents a piece of metal-such as steel-plate-and b b are holes made therein. The position of the holes b b is such as to receive the studs a a when the piece B is laid against 'the piece A. The making of those corresponding holes in the piece to be riveted to the piece A may be regarded as the second step in the method I follow, although it is not essential that these two steps should be taken in the order set forth. The next step is to lay the pieces A and B against each other in such manner that the studs a a will enter the holes b b, the said studs being long enough to extend slightly beyond the plate B. The iinal'step is to head the rivets down upon one piece and spread them later-- ally at their other ends in the other piece. This I accomplish by means of xed studs c c, having conical ends adapted and arranged to (No model.) C*

enter the sockets made by setting out the studs a a, in connection with vertically movable studs or headers o c', also having conical ends and arranged directly over the studs c c. To head the rivets, I lay the piece A on the studs c c, so that these studs will enter the sockets above referred to, having first placed the piece B on the piece A, so that the studs a a will enter the holes b b, the studs c c being raised sufficiently to permit both plates to be ar ranged between the studs c c and c c.. To produce the best results, the conical parts of the studs c c shouldl be in contact with the plate A when the points of those studs touch the inner ends of the studs a a. I then depress the studsor headers c' c. By this means the upper ends of the studs a @will be spread out laterally or headed down upon the piece B by means of the studs c c', and their lower ends will also be spread out somewhat by means of the studs c c, which, as the piece A is thus pushed. down upon them, will make the recesses in the piece A slightly flaring, while the points of the studs e owill enter the lower ends ofthe rivets andl spread them out into these flaring recesses. The piece A will center itself on the conical points of the studs c c, so as to bring the upper ends of the rivets directly underneath the studs c c. I now raise the studs c c and remove the plates A and B, which will be very irmly'riveted together.

It will be perceived from the foregoing description, and from reference to the drawings, that this method of rivetingtwo parts'together has Vmany advantages. The work may be performed expeditiously and economically, and

the parts are very strongly riveted to each and means being such as to head the rivets in the plate from which they are punched, as

herein shown and described7 while the means the other, superposing the plates one on the employed by the said Carhart do not produce other, the studs on the one extending into and that result or the product of my process. through the vholes in the other, and then rivet- 15 Having thus described my invention, what I ing the plates together by means of riveting- 5 claim as new` and desire to secure by Letters toolsthat shallsimnltaneouslyspreadthe metal Patent, isand form heads on both the outer and the still- An improvement in the art of attaching engaged inner end of each stud.

metallic plates or sheets to one another-to wit,

preparing the plates by partially removing JOHA M' GRIEST io the metal from one of them, so as to produce XVitnesses:

on its surface a number of projecting studs', F. F. VARNER.

and by making holes corresponding theretoin HENRY FRANKFURTER. 

